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@wikipedia
The difference between phase pressures due to difference in fluids interaction with rock matrix:
One of the strong assumptions in reservoir fluid dynamic modelling is that 3-phase capillary pressure is a function of one saturation only:
(3) |
p_{cog} = p_{cog}(s_o) |
|
a function of oil saturation only
s_o |
(4) |
p_{cow} = p_{cow}(s_w) |
|
a function of water saturation only
s_w |